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| Chat and workspace agents: channels, DMs and named agents you talk to | 1 | import { useEffect, useRef, useState } from "react"; |
| 2 | ||
| 3 | import type { ChatLiveEvent } from "@g1t/contracts"; | |
| 4 | ||
| 5 | import { backoff } from "../../lib/chat"; | |
| 6 | ||
| 7 | export type LiveState = "connecting" | "open" | "reconnecting"; | |
| 8 | ||
| 9 | /** | |
| 10 | * A conversation's live socket (routes/workspace/chat/live.ts): every event | |
| 11 | * goes to `onEvent`; a dropped socket comes back on its own, waiting longer | |
| 12 | * each time up to half a minute, and at once when the tab is shown again or | |
| 13 | * the network returns. `onReconnect` runs after each return, so the page | |
| 14 | * can fetch what it missed. `send` writes to the socket when it is open. | |
| 15 | */ | |
| 16 | export function useChatLive( | |
| 17 | slug: string, | |
| 18 | channelId: string, | |
| 19 | onEvent: (event: ChatLiveEvent) => void, | |
| 20 | onReconnect: () => void, | |
| 21 | ): { state: LiveState; send: (message: object) => void } { | |
| 22 | const [state, setState] = useState<LiveState>("connecting"); | |
| 23 | const socket = useRef<WebSocket | null>(null); | |
| 24 | const handlers = useRef({ onEvent, onReconnect }); | |
| 25 | handlers.current = { onEvent, onReconnect }; | |
| 26 | ||
| 27 | useEffect(() => { | |
| 28 | let attempt = 0; | |
| 29 | let timer: ReturnType<typeof setTimeout> | null = null; | |
| 30 | let closed = false; | |
| 31 | let opened = false; | |
| 32 | const connect = () => { | |
| 33 | if (closed) return; | |
| 34 | timer = null; | |
| 35 | const scheme = location.protocol === "https:" ? "wss:" : "ws:"; | |
| 36 | let ws: WebSocket; | |
| 37 | try { | |
| 38 | ws = new WebSocket(`${scheme}//${location.host}/${slug}/-/chat/live?channel=${encodeURIComponent(channelId)}`); | |
| 39 | } catch { | |
| 40 | schedule(); | |
| 41 | return; | |
| 42 | } | |
| 43 | socket.current = ws; | |
| 44 | ws.onopen = () => { | |
| 45 | const again = opened; | |
| 46 | opened = true; | |
| 47 | attempt = 0; | |
| 48 | setState("open"); | |
| 49 | if (again) handlers.current.onReconnect(); | |
| 50 | }; | |
| 51 | ws.onmessage = (message) => { | |
| 52 | try { | |
| 53 | handlers.current.onEvent(JSON.parse(String(message.data)) as ChatLiveEvent); | |
| 54 | } catch { | |
| 55 | // Not an event this page knows: ignored. | |
| 56 | } | |
| 57 | }; | |
| 58 | ws.onclose = () => { | |
| 59 | if (socket.current === ws) socket.current = null; | |
| 60 | if (closed) return; | |
| 61 | setState(opened ? "reconnecting" : "connecting"); | |
| 62 | schedule(); | |
| 63 | }; | |
| 64 | ws.onerror = () => ws.close(); | |
| 65 | }; | |
| 66 | const schedule = () => { | |
| 67 | if (closed || timer) return; | |
| 68 | timer = setTimeout(connect, backoff(attempt++)); | |
| 69 | }; | |
| 70 | // Back now, not after the wait: the tab is shown, or the network returned. | |
| 71 | const now = () => { | |
| 72 | if (closed || socket.current || document.visibilityState !== "visible") return; | |
| 73 | if (timer) clearTimeout(timer); | |
| 74 | timer = null; | |
| 75 | attempt = 0; | |
| 76 | connect(); | |
| 77 | }; | |
| 78 | connect(); | |
| 79 | document.addEventListener("visibilitychange", now); | |
| 80 | window.addEventListener("online", now); | |
| 81 | return () => { | |
| 82 | closed = true; | |
| 83 | if (timer) clearTimeout(timer); | |
| 84 | document.removeEventListener("visibilitychange", now); | |
| 85 | window.removeEventListener("online", now); | |
| 86 | socket.current?.close(); | |
| 87 | socket.current = null; | |
| 88 | }; | |
| 89 | }, [slug, channelId]); | |
| 90 | ||
| 91 | const send = (message: object) => { | |
| 92 | const ws = socket.current; | |
| 93 | if (ws && ws.readyState === WebSocket.OPEN) ws.send(JSON.stringify(message)); | |
| 94 | }; | |
| 95 | return { state, send }; | |
| 96 | } |
